package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Slf4j
@Component
public class JwtTokenUserInterceptor implements HandlerInterceptor {
    @Autowired
    private JwtProperties jwtProperties;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("拦截到请求"+request.getRequestURI());
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            // import org.springframework.web.method.HandlerMethod;
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());
        log.info("从请求头中获取token:{}", token);
        //校验令牌
        try {
            log.info("用户端jwt校验：{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            //把userId转换为Long类型
            Long userId = claims.get(JwtClaimsConstant.USER_ID, Long.class);
            //设置当前用户id到线程变量中
            log.info("将userId添加到线程变量中");
            BaseContext.setCurrentUserId(userId);
            log.info("当前用户id:{}", userId);
            //放行
            return true;
        } catch (Exception ex) {
            System.out.println("用户端token校验失败");
            ex.printStackTrace();
            //不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
